144220261 has 4 divisors (see below), whose sum is σ = 146941452. Its totient is φ = 141499072.

The previous prime is 144220207. The next prime is 144220273. The reversal of 144220261 is 162022441.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 131217025 + 13003236 = 11455^2 + 3606^2 .

It is a cyclic number.

It is not a de Polignac number, because 144220261 - 2⁷ = 144220133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144220201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1360516 + ... + 1360621.

It is an arithmetic number, because the mean of its divisors is an integer number (36735363).

Almost surely, 2^144220261 is an apocalyptic number.

It is an amenable number.

144220261 is a deficient number, since it is larger than the sum of its proper divisors (2721191).

144220261 is an equidigital number, since it uses as much as digits as its factorization.

144220261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2721190.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 144220261 is about 12009.1740348785. The cubic root of 144220261 is about 524.4153867366.

The spelling of 144220261 in words is "one hundred forty-four million, two hundred twenty thousand, two hundred sixty-one".